Currently being human is an advantage over other races. (This has been discussed countless times so I'm not going into every detail)

Using PvP trinket you lose about 500+ of your primary stat and some awesome proc/on-use effect that comes with it...

This is most hurtful at end of last season when not wearing PvP trinket isn't a huge resilience loss. 3% damage reduction isn't nothing compared to those extra stats/procs from PvE trinkets...

Now in the next expansion Blizzard needs to either give PvP trinket a passive stat bonus or remove Every Man For Himself racial ability or give it to every race. Else playing human and getting high rated will stay easier compared to other races...

Why should a race choice have such an impact on your damage/healing output in PvP? Just look at arena rating charts, every human there has some OP trinket in their other slot next to their on-use trinket, how is that not overpowered?

Similar situation is with stealth vs stealth class, first who gets the opener has an upper hand, but can still lose due to some bad luck.

The issue where players are changing to human to get the second PvE trinket is something that we want to address in Pandaria. Understand that we want the human racial to be appealing and at this time it is, but we feel that the main issue is that PvP trinkets do not compete with PvE trinkets well enough to validate their use over being human.

With PvP trinkets having PvP power and defense stats in Mists, they will be much better for PvP than the PvE ones. We would also like to introduce a greater variety of PvP trinkets to increase their appeal even further :)